Vulcanization of rubber



Patented Oct. 16, 1928.

UNITED STATES PATENT OFFICE.

CECIL JOHN TUBRELL CRONSHAW AND. WILLIAM JOHNSON SMITH N AUNTON, OF

MANCHESTER, ENGLAND, ASSIGNQRS TO BRITISH DYESTUFIS CORBORATION LIK- ITED, OF MANCHESTER, ENGLAND.

VULCANIZATION OF RUBBER.

in Drawing. Application filed January 4, 1926, Serial N0. 79,260, and in Great Britain March 12, 1925.-

It is known that various diary1-guanidines can be used as accelerators of the vulcanization of rubber. IVe have found that that the di-xylyl-gua'ni(lines and espeeiaIIy di-meta- I xyIyI-guunidines offer special advantages in this respect in that they give a better Vulcanized product in a shorter time than the lower homologues hitherto employed. (Xaunton,

. Jour. Soc. Chem. Industry, 1925, 44. p. 246.

T.) We prefer to manufacture the di-xyiyiuanidines by the method described in our .iritish Patent l\'o. 223,410, but the other known methods can also be used, and either pure xylidines or a mixture of the isomeric Xylidines can be used as the initial materia for the manufacture.

We claim A process for accelerating the vulcanization of rubber which comprises eombinin rubber with dimeta-xylyl guanidine and vu canizing the rubber.

In testimony whereof we have hereunto afiixed our signatures.

CECIL JOHN TURRELL CRONSIIAW. WILLIAM JOHNSON SMITH NAUNTON. 

